From: CHBAviation@aol.com
Message-ID: <81.be158b9.28603552@aol.com>
Date: Tue, 19 Jun 2001 00:55:46 EDT
Subject: Re: 345hp lycoming
To: aaronmay82@lycos.com, lancair.list@olsusa.com
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Reply-To: lancair.list@olsusa.com

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In reference to the Lycoming engine, I've found that putting in high 
compression pistons will lower your TBO time.  It makes the engine produce 
more heat and takes the norm imbalance of the cylinders and makes them worse. 
 If you are looking for higher HP from your cylinders and make them run 
smoother, you need to match flow them on a flow bench.  For ex - 360 Lycoming 
engine that should produce 180HP you put all 4 cylinders on a bench and float 
them you'll will get about 160-165.  When you open them up and bring them to 
specks you should be able to get 180HP.  If your looking for more, open the 
port to 1% and the exhaust to 3%, the highest capable of those cylinders thus 
far has been 204 HP on a straight valve Lycoming engine.  If you were to take 
IO-360 200HP angle valve, that has Venture Valve Guides, these can be opened 
up to approx. 220-230HP.  The reason the variance of what the HP is, is the 
fact that you have to flow it to the lowest cylinder to make all cylinders 
equal.  One of the ES's that I recently completed was at Oshkosh last year on 
display at the Lancair tent.  That aircraft had a used 520 engine rated at 
285 HP.  I ceramic coated the intake and exhaust and installed an electronic 
ignition and it ran super cool and burned a mere 12.5 GPH at 8,000 ft.  And 
with a used 520 engine, we were getting a bit better than the published 
numbers that Lancair states.  I probably could have leaned it back even more 
so since it was running so cool but we figured gas was less $ than a new 
engine!  
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Please send your photos and drawings to marvkaye@olsusa.com.
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